Evaluation of Test Methods for Measuring the Bond Strength of Portland Cement Based Repair Materials to Concrete

    Volume 11, Issue 1 (July 1989)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 12


    Spring, CB
    Research civil engineer and senior laboratory technologist, National Institute of Standards and Technology, Center for Building Technology, Gaithersburg, MD

    Knab, LI
    Research civil engineer and senior laboratory technologist, National Institute of Standards and Technology, Center for Building Technology, Gaithersburg, MD

    Abstract

    Three bond strength test methods were evaluated for screening and selecting repair materials used in overlaying and patching portland cement concrete. Bond strengths of three repair materials to base concrete were investigated using two uniaxial tension bond strength test methods and a slant shear bond strength test method. The differing strengths of the repair materials caused different failure patterns, which had to be considered in the analyses of the failure stresses.

    Substantial differences in the failure stresses of the uniaxial tension and slant shear test methods were attributed to their different geometries and loading conditions. These differences emphasized the need to select test method(s) with geometry, loading conditions, and stress states that are anticipated for the in-service repair material.

    For the two higher strength repair materials investigated, the relative precision (repeatability) of the slant shear and one of the uniaxial tension test methods (pipe nipple grips) were comparable and relatively good (coefficient of variation values were about 5%). It was concluded that both the slant shear test method and the pipe nipple grips uniaxial tension test method are promising methods for screening and selecting repair materials of the type investigated (portland cement concrete or latex-modified concrete) for overlaying or patching portland cement concrete.


    Paper ID: CCA10096J

    DOI: 10.1520/CCA10096J

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    Author
    Title Evaluation of Test Methods for Measuring the Bond Strength of Portland Cement Based Repair Materials to Concrete
    Symposium , 0000-00-00
    Committee C09